Amplitude Modulation
The amplitude of the carrier wave is modified in line with the amplitude of the information signal or modulating signal in amplitude modulation, as we all know.
In the case of a sinusoidal modulating wave, m(t)=Amsinωmt………….(1) Amis the Amplitude of modulating wave ωm−2πωmis the Angular frequency of modulating wave For carrier wave Cm(t)=Acsinωct…….
Communication Has Evolved
The table below depicts how actual couriers who travelled from one location to another evolved into today's reality, in which information is delivered to your doorstep at any time and with ease of access.
Communication System
The following is a diagram of a typical communication system The basic elements of communication are the transmitter, channel, and receiver, as seen above.
The transmitter and receiver may be in different geographical locations.
The Channel is the link between the transmitter and receiver.
1) Information Source- The source generates a signal that c.
Communication – Terminology
Transducer – A transducer is a device that transforms energy from one form to another.
Electrical transducer: A device that translates physical variables such as pressure, displacement, force, and.
Electromagnetic Waves Propagation
When employing radio waves for communication, the transmitter antenna emits electromagnetic waves.
These waves travel through space and eventually arrive at the receiving antenna on the other end.
Some wave propagation methods have been briefly discussed below.
Modulation and Its Necessity
In general, a message signal is not a single frequency sinusoidal signal.
However, it is dispersed throughout a frequency range known as the signal bandwidth.
If we want to send an electronic signal in the audio frequency range, say 20 Hz to 20 kHz, over a long distance, we must consider things like.
1) Size of Antenna:Both transmission and receptio.
Transmission Medium – Bandwidth
Different types of transmission media have varying bandwidth capabilities.
Coaxial cables, a commonly used wire media, with a bandwidth of about 750 MHz.
Radio waves can be used to communicate in free space at frequencies ranging from hundreds of kHz to a few GHz.
In the frequency range of 1THz to 1000 THz (THz – TeraHertz; 1THz = 1012Hz), optical .
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,It means the
person who wants to convey his ideas and thoughts to another person. The sender is the ‘source’ of the communication.
